I have a Terminator 50 that my middle son rides, He is getting a little older and little bigger, I wanted to know if you guys think I could find a sprocket change up so that little 50 will have more low end power to help get him through trails or would there be any kind of performance mods I could do to get more out of that 50 on the low end.

 

Don't know this for sure but I would start by removing the sprocket (front) and trying to take it to your local atv dealer and attempt to match it up. You may find that it'll match the size of a Japanese kid's atv. If this method fails I'd try your local lawnmower supply/dealer. It might sound weird but a snowblower or rototiller or something similar may use that size sprocket.
I do not think the same will work for the rear sprocket because the design of the rear sprockets are usually specific to individual applications. To your atv in other words. The best chance on a rear sprocket purchase would be with Raceway, if not they may have more information available also.

 

the terminator is the same quad as the kazuma meerkat, this is the smallest chinese atv made, if you son is over 5 years old it's time for a bigger quad. as far as the countershaft spocket is concern, for lower gear, just count the number of teeth on the exsiting spocket then order a one tooth smaller for a 420 chain size, all countershaft for any of the chinese 50-110cc that uses the 420 chain will work, here's one source Text

 

Yeah, I agree with the new quad. Here is my plan, I've seen a little 90 at gander mountain store it is a kolpin 90cc. I plan on getting one of those for my oldest son and giving my middle son the APC 90cc that he is riding now. The APC is not that strong of a quad either however it is a lot more powerful than the terminator and will allow my middle son to grow into it.